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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1dbfc00ca4a154430370ca4967df8a19d4d3b9c13c28c6d0ae47f5666ada17' 
  AND token = 'mcUDdIqCYWqi/Yb9n+1jhyZsoo86vnNbAD77L8gX5OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}